9.5K views · 442 reactions | Two steel columns, from the North Tower, known as tridents. They are the first artifact that visitors encounter as they make their descent into the 9/11 Memorial Museum and the only one visible from the 9/11 Memorial. www.911memorial.org/visit | National September 11 Memorial & Museum | Facebook

On September 11, 2001, Michael Hingson was on the 78th floor of the North Tower of the World Trade Center when American Airlines Flight 11 struck 18 floors above him. Michael is blind. With smoke filling the stairwells and chaos erupting all around, his guide dog, Roselle, calmly led him and dozens of others to safety. Step by step, floor by floor, they descended 1,463 stairs through fear, jet fuel fumes, and panic. This is one of the most remarkable true survival stories of 9/11 — not just abou